1) How much energy is needed to raise the temperature of 1kg of water by 1 celsius? (SHC of water = 4200J/KgC) a) 4200 Kg b) 4200 J c) 420 J d) 8400 J 2) What doe specific latent heat mean? a) The energy required to increase the temperature by 10 celcius b) The energy required to reduce teh temperature by 1 celcius c) The energy required to change the state of 1kg of material 3) Cavity wall insulation cost £500 to install and you save £50 per year. Calculate the payback time. a) 10 years b) 10 months c) 5 years d) 50 years 4) How does a microwave cook food? a) The microwaves cause the hydrogen molecules to vibrate generating heat b) The microwaves generate infra red radiation that heat up the food through convection c) The microwaves are conducted through the food d) The miocrowaves interact with water molecules to create vibrations 5) What type of thermal energy transfer can pass througha vacuum? a) Conduction b) Convection c) Radiation 6) What statement best describes how a fibre optic cable works? a) The light is conducted through the fibre by vibrating the molecules b) The light hits the side at greater than the critical angle and reflects along the fibre c) Total internal reflection occurs at the ends of the fibre d) The light refracts at the edges of the fibre 7) Which part of the electromagnetic spectrum transmits the greatest amount of energy. a) Ultra violet b) Visible c) Infra red d) Gamma rays 8) A wave on a pond has a wavelength of 2m and travels at 5 m/s. Calculate the frequency of the wave. a) 2.5 Hz b) 2.5 J c) 5 Hz d) 2 m 9) The sun index is given as 4. How long could a person stay in the sun if they were wearing SPF 10? a) 4 hours b) 1 hour c) 10 hours d) 40 hours 10) A car burns 200 J of fuel, 50 J are converted into kinetic energy. Calculate the efficiency of the car engine. a) 75% b) 25 % c) 50 % d) 0.75

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